Answer: -
In the periodic table elements are arranged in increasing order of their atomic number.
The vertical columns are called groups. The horizontal rows are referred to as periods.
From the group number of the element, we can know the number of valence electrons present. Thus if the element is in Group 2, then there are 2 valence electrons.
From the period number we can find the number of electron orbits. For example if the period number of an element is 3, then it has 3 orbits.
Depending on which group the element belongs to, we can predict certain properties of the element as well.
For example. if the element belongs to group 1 or 2, then they are good reducing agents, having low ionization enthalpy and found at the top of the electrochemical series.
If the element belongs to group 3 to 12 then they are transition metals, with their compounds being colored.
If the element belongs to group 18 then they are the noble gases.
